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#96952 12th Oct 2004 4:06pm
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Ever noticed that Imprezas sound like they are "misfiring"???

Well, after listening to some rally car Imprezas, they sound more like a normal 4 cylinder car confused

After a bit of digging Ive found out why smile

The Impreza is a flat 4 - 2 cyliners point left and 2 point right. The turbo, however sits to the left of the engine (looking from the front).

The Misfire sound is caused by the time it takes the "bang" from the right hand side cylinders to get to the turbo, and causes 1 of the cylinders to sound like it is firing with one on the left.

The rally cars however use equal length manifolds, causing all "Bangs" to arrive at the turbo at the same time, and give the car a more "normal" sound.

Lol, useless info prolly, but it was something I had been thinking about for a while smile


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#96953 12th Oct 2004 4:29pm
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I think they have a distinctive cool purr to them, (grunt)

But like you say, I always wondered why or how?

Nice one,
i'm one person who didnt fined it usless happy

#96954 12th Oct 2004 4:36pm
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Nice one smile


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#96955 12th Oct 2004 4:52pm
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general info thats quite gud to know explains it now when u tink about it, stil sound sweet tho!


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#96956 12th Oct 2004 5:01pm
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i luv the way u always know when a scooby is coming!!!!!

#96957 12th Oct 2004 7:15pm
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never nu that m8!!!!! thats intresting info good!!


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#96958 12th Oct 2004 7:23pm
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Very interesting that mate love snippets of information like that will probably listen motre closely to a scooby now!

#96959 12th Oct 2004 7:38pm
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Yep, two manifolds, distributor in the middle. Another name for these cars is a Boxer.
I thought the turbine sat to the right of the engine?

It's a nice sound, but nothing matches a Porsche 911. How it makes that sound.....


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#96960 12th Oct 2004 9:14pm
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Great Info Stewy, To simplify it slightly the exhaust headers (Manifolds) are not equal in lenght, one is quite a bit longer than the other so as you correctly say it takes longer for the exhaust gases to travel through that manifold than the other hence producing the Mis-fire growl.

I have been looking at "Equal lenght Manifolds" for my Impreza recently as they provide more power gains however you loose the renowned Impreza Growl that makes them sound like they are mis-firing. Sorry but i couldnt do that to my Impreza.... Its one of the features of an impreza that makes it quite unique.

#96961 13th Oct 2004 5:18pm
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Yeah, keep the inequal lengths. The sound is v. distinctive, and you'll save yourself a fair few hundred quid too.


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#96962 13th Oct 2004 7:12pm
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Quote
Originally posted by StationMiek:
It's a nice sound, but nothing matches a Porsche 911. How it makes that sound.....
They're boxer engines too, just with a couple of extra cylinders slapped on the end. For me the note of an AC cobra is unbeatable, lucky for me the jeep sounds almost exactly the same! smile smile

#96963 13th Oct 2004 7:37pm
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the note of my dads v8 formula boat is unbeatable nt it jimbo happy but i love the scooby sound its awsome and hopefully i keep doin well with my job and im havin a nu 1 on finance nxt yr and thats no lie happy


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#96964 14th Mar 2006 4:14am
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would it be daft of someone to make an unequal length manifold for a in line 4 like a zetec,having one of the pipes goin off on a kinf and coming back to join the "collector" so u get a 2 step tone?


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